I am picking up my new Savage Mark II-F rimfire this Friday, however I noticed when purchasing it, it did not come with a scope mount. The receiver is tapped, but Im not sure what mount or base I need.

Here is my model, with the base shown - however I am not sure (1) where to get these and (2) if its a dovetail or weaver base

About 20MOA. I am just kidding.
20MOA mounts are for long range shooting. Some scopes don't have enough adjustment range to compensate for bullet drop at these extended range say 200 yard. This builds in a certain amount of bias.